package cn.itcast.hotel.service.impl;

import cn.itcast.hotel.mapper.HotelMapper;
import cn.itcast.hotel.pojo.Hotel;
import cn.itcast.hotel.pojo.HotelDoc;
import cn.itcast.hotel.pojo.PageResult;
import cn.itcast.hotel.pojo.RequestParams;
import cn.itcast.hotel.service.IHotelService;
import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.geo.GeoPoint;
import org.elasticsearch.common.unit.DistanceUnit;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.functionscore.FunctionScoreQueryBuilder;
import org.elasticsearch.index.query.functionscore.ScoreFunctionBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;


@Service
public class HotelService extends ServiceImpl<HotelMapper, Hotel> implements IHotelService {

    @Autowired
    private RestHighLevelClient client;

    @Override
    public PageResult search(RequestParams params) {
        try {
        // 1.准备Request
        SearchRequest request = new SearchRequest("hotel");
        buildBasicQuery(params, request);

            // 2.2.分页
        int page = params.getPage();
        int size = params.getSize();
        request.source().from((page -1)* size).size(size);
        //地理位置
            String location = params.getLocation();//获取经纬度
            if (org.apache.commons.lang3.StringUtils.isNoneBlank(location))
            request.source().sort(
                    SortBuilders.geoDistanceSort("location",new GeoPoint(location))
                            .order(SortOrder.ASC)
                            .unit(DistanceUnit.KILOMETERS));

            // 3.发送请求
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
            // 4.解析响应
            return handleResponse(response);
        } catch (IOException e) {
            throw new RuntimeException("搜索数据失败",e);
        }
    }

    //把条件查询抽成方法
    private void buildBasicQuery(RequestParams params, SearchRequest request) {
        // 构建BooleanQuery
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        // 2.准备DSL
        String key = params.getKey();
        // 2.1.query
        //关键字搜索
        //if (key == null || "".equals(key)){
        //    request.source().query(QueryBuilders.matchAllQuery());
        //}else {
        //    request.source().query(QueryBuilders.matchQuery("all",key));
        //}
        if (key == null || "".equals(key)) {
                boolQuery.must(QueryBuilders.matchAllQuery());
            } else {
                boolQuery.must(QueryBuilders.matchQuery("all", key));
            }
        //尘世条件
        if (params.getCity() != null && !params.getCity().equals("")){
            boolQuery.filter(QueryBuilders.termQuery("city",params.getCity()));
        }
        //平拍条件
        if (params.getBrand() != null && !params.getBrand().equals("")){
            boolQuery.filter(QueryBuilders.termQuery("brand",params.getBrand()));
        }
        //星际条件
        if (params.getStarName() != null && !params.getStarName().equals("")){
            boolQuery.filter(QueryBuilders.termQuery("starName",params.getStarName()));
        }
        // 6.价格
        if (params.getMinPrice() != null && params.getMaxPrice() !=null){
            boolQuery.filter(QueryBuilders.rangeQuery("price")
                    .gte(params.getMinPrice())
                    .lte(params.getMaxPrice()));
        }
        //广告加权重
        QueryBuilders.functionScoreQuery(
                // 原始查询，相关性算分的查询
                boolQuery,
                // function score的数组
                new FunctionScoreQueryBuilder.FilterFunctionBuilder[]{
                        // 其中的一个function score 元素
                        new FunctionScoreQueryBuilder.FilterFunctionBuilder(
                                QueryBuilders.termQuery("isAD",true),
                                ScoreFunctionBuilders.weightFactorFunction(100)
                        )
                });

        // 7.放入source
        request.source().query(boolQuery);
    }

    //解析
    private PageResult handleResponse(SearchResponse response){
        // 4.解析响应
        SearchHits searchHits = response.getHits();
        // 4.1.获取总条数
        long total = searchHits.getTotalHits().value;
        // 4.2.文档数组
        SearchHit[] hits = searchHits.getHits();

        // 4.3.遍历
        List<HotelDoc> hotels = new ArrayList<>();
        for (SearchHit hit : hits) {
            // 获取文档source
            String json = hit.getSourceAsString();
            // 反序列化
            HotelDoc hoteDoc = JSON.parseObject(json, HotelDoc.class);
            //获取排序
            Object[] sortValues = hit.getRawSortValues();
            if (sortValues.length>0){
                Object sortValue = sortValues[0];
                hoteDoc.setDistance(sortValue);
            }
            // 放入集合
            hotels.add(hoteDoc);
        }
        // 4.4.封装返回
        return new PageResult(total, hotels);
    }
}
